Means for transmitting electrical energy.



No.'697,|23. Patented Apr. 8, I902. J. E. WOUDBRID'GE.

MEANS FOR TRANSMITTING ELECTRICAL ENERGY. (Application filed Sept 20,1901.)

(No Model.)

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Witnesses. lnvenfiort W 2 QLM. Jonathan EWoodbridgc.

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UNITED STATES PATENT OFFICE.

JONATHAN E. IVOODBRIDGE, OF SOHENEOTADY, NEW' YORK, ASSIGNOR TO GENERALELECTRIC COMPANY, A CORPORATION OF NEIV YORK.

MEANS FOR TRANSMITTING ELECTRICAL ENERGY.

SPECIFIGATION forming part of Letters Patent N 0. 697,123, dated April8, 1902.

Application filed September 20,1901x Serial No. 75,733 (No model.)

To aZZ whom, it 72260; concern:

Be it known that I, JONATHAN E. Woon- BRIDGE,a citizen of the UnitedStates,residing at Schenectady, in the county of Schenectady and Stateof New York, have invented certain new and useful Improvements in Meansfor Transmitting Electrical Energy, (Case No. 1,779,) of which thefollowin is a specification.

In polyphase transmission to rotary converters, and particularly torotary converters used for railway-suppl y, where compounding orovercompounding is desirable, it is now common practice to make use ofthe reactance of leading and lagging currents on line inductances toobtain at the receiving end constant voltage invariable with loadvariations or to obtain voltage at the receiving end rising withincreasing load, the pressure at the transmitting end remainingconstant. The field strength of the rotaries is varied by the loadgenerally by the application of series coils, so that the phase relationof the line-currents and impressed electromotive forces changes with theload, the currents lagging behind the impressed electromotive forces atlight loads and leading them at heavy loads. As the current changes fromlagging at light loads to leading at heavy loads theimpedance drop intheline is changed from partial opposition to partial conjunction withtheimpressed electromotive force, thereby causing the electromotiveforce at the receiving end of the line, which is the resultant of theimpressed electromotive force and impedance drop, to change from a Valueless than the impressed electromotive force to a value which may begreater.

To accomplish the results mentioned, it has been customary to put thereactive coils in the low-tension supply from the step-down transformersto the rotary converters. I have discovered that if the inductivereactance is distributed over the Whole length of the transmission-linerather thanlocalized at the receiving end in accordance with presentcustom a uniform boosting eltect may be produced over the Whole lengthof the transmission-line, thereby enabling a uniform difference ofpotential to be maintained between the transmission wires or linesthroughout the Whole length of the circuit. The electromotive force atthe receiving end being made the same at all loads as that at thetransmitting end embodies the important advantage of increased economyin those cases Where the pressure at the transmitting end is as high asconditions of safety will permit and Where the drop in the line underthe usual conditions would be great. ()0

The drawings illustrate diagrammatically a system embodying myinvention, the features of novelty of which are pointed out in theappended claims.

For simplicity of illustration the invention is shown as embodied in asingle-phase system; butit willbe understood thatit is equallyapplicable to polyphase systems, and in practice would more often beemployed in connection With the latter.

In the drawings the transmitting end of an alternating-current system isrepresented conventionally by a generator 1 and its exciter 2.Transmission-lines 3 4 extend therefrom to a distance and supply currentto the receiving end of the circuit, (represented in this case asconsisting of a step-down transformer 11 and a rotary converter 5.)Although but a single rotary converter is illustrated, it is obviousthat any number maybe employed, if desired, and that other translatingdevices may be supplied without departing from the spirit of myinvention. The rotary converter 5 is provided with the usual shunt andseries windings 6 and 7, respectively. Translating devices, such asrailway motors or lamps, may be supplied by the rotary converter fromits directcurrent leads 8 9, as indicated.

Distributed at intervals along the transmission-lines 3 4 are more orless numerous o ind uctancc or reactance coils 10 in series with thelines, these numerous reactive coils taking the place of the coilsusually inserted in the transmission-lines in the immediate vicinity ofthe rotary converter or converters. The reactive effect beingdistributed over the Whole transmission-line instead of localizedproduces a uniform boosting effect in place of the localized boostingeffect heretofore obtaincd.

What I claim as new, and desire to secure by Letters Patent of theUnited @tates, is

1. The combination-of a source of alternating currents, lines extendingtherefrom, inductance-coils connected at intervals in said lines, and acompound-wound.- rotary converter supplied with current from said lines.

ing currents, transmitting lines extending therefrom, a series atinductance-coils connected in each line, and a compound-wound rotaryconverter connected to the receiving end of the transmission-lines.

3. The combination of a source of alternating currents, transmitting-1ines extending therefrom, inductance-coils located at intervals insaid lines, and a source of leading current connected to the receivingend of the 4. The combination of a source of alternatingcurrent,transmissi0n-1ines supplied thereby, inductance-coils connectedat regular intervals in said lines, and assource of leading curren'tsuchas" rotary converter supplied with current from the receiving end 'ofthe transmission-lines.

In witness whereof I have hereunto set my hand this 16th day ofSeptember, 1901.

JONATHAN E. "WOODBRIDGE.

Witnesses:

BENJAMIN B. HULL,

MARGARET E.WooL LEY.

